出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We propose a phenomenological approach that uses the spectral features of the rising part of the Inverse Compton emission of the blazars Spectral Energy Distribution, to derive the low-energy branch of the energy distribution of the emitting particles. We base our analysis on a leptonic, single-zone, homogeneous, Synchrotron Self-Compton, and External Compton scenario. Our analysis shows that is possible to use the values of photon index ( X) observed in INTEGRAL Flat Spectrum Radio Quasars (FSRQs) and intermediate/low-peaked BL Lacs (I/LBLs), and the photon index (
) observed in Fermi-LAT high-peaked BL Lacs (HBLs), to constrain the low-energy cut-o (
min), and the low-energy photon index (s), of the emitting particles energy distribution. We found, in the case of FSRQSs and I/LBL Lacs, that INTEGRAL data rule out a scenario with
min>> 1 . In the case of HBLs, Fermi data hints for a scenario with
min<< 104, in agreement with previous analysis of the HBL Mrk 421, based on simultaneous X-ray-to-UV data. The predicted ranges for s, derived from observed data, are ' [1:62:4], and ' [1:22:8], respectively for HBLs, and FSRQs and I/LBLs. The similarity in the range of the predicted values of s, and the same trend of the position of the low-energy cut-o of the electron distribution, observed in FSRQs and BL Lacs, are interesting features, hinting for a common acceleration scenario acting in the two classes of objects.
